This research concerned about the effects of low-molar-mass liquid crystal (LMLC) blend with polycarbonates (PCs) that influence the processing conditions (torques) without detrimental to the benign properties of PC. The two PCs, having different weight-average molar mass (PC2600 and PC2405), were blended with LMLC (CBC-33) at concentration about 0.2 wt % using a single screw extruder. As confirmed by the previous observation of Motong et al. (J Appl Polym Sci 2008, 107, 1108), the LMLC could act as a melt viscosity reduction additive for PCs. Because of the reduction in melt viscosity of PC, the operating torque of a single screw extruder used when extruding PC blended with LMLC was reduced up to 83% depended on the mixing condition of LMLC. The mechanical properties were determined by tensile testing specimens from injection molding machine, and the difference of tensile strengths and modulus of elasticity between pure PCs and their blends was less than 10%, which indicated the very low detrimental effects to mechanical properties of the LMLC blend. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 113: 752-756, 2009